<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <style>
        
    </style>
</head>
<body>
    
</body>
<script>

    // console.log( {name:"admin"} + {name:"root"} );
    // console.log( {name:"admin"} - {name:"root"} );

    var d1 = new Date(2000,1,1);
    var d2 = new Date(2008,1,1);

    // var t = d1 - d2;
    var t = Math.abs(d1.getTime() - d2.getTime());

    console.log( t );

</script>
</html>